I think you already gave yourself the answer in your own case:
Because I give zero crap about what other people think of me.
This applies to people that aren’t in your inner circle. You want HER to be in that circle and suddenly it actually does matter what SHE thinks of you. You have little to lose with people you don’t really care about, but everything to lose with people you do care about. It’s an evil social twist that makes everything so complicated. High self-esteem is just the ability to quickly pull yourself up when you fall and the knowledge that you actually CAN do so. It mitigates the risks of “putting yourself out there”.
Their concern is not solely based on the gene modification. The impact of introducing a new crop is bigger than that. The golden rice is patented and that often comes with a ton of regulations the local farmers have no control over.
While I wish for there to be a good way to solve the food problem AND find a good use for gene modification, I don’t think that this particular instance is it…